USA 1965 Gemini 5

Gemini 5 (GT-5), launched on August 21, 1965, was the third Gemini manned flight crewed by Gordon Cooper and Charles "Pete" Conrad. It was also the first time an American manned space mission held the world record for duration, set on August 26, 1965, by breaking the Soviet Union's previous record set by Vostok 5 in 1963. The crew remained in space for 8 days, which was the expected length of time required to fly to the moon, land and return to Earth.